1. The geological period from approximately 201 million to 145 million years ago, distinguished by the dominance of dinosaurs and the emergence of the first birds
   "The Jurassic period saw the evolution of many new dinosaur species";
   - Jurassic period

1. Of or relating to or denoting the second period of the Mesozoic era
   "Dinosaur fossils from the Jurassic period were discovered in the excavation"

Type of: geological period, period

Part of: Age of Reptiles, Mesozoic, Mesozoic era

Encyclopedia: Jurassic